A quick warning: 5GHz signals have more bandwidth but less range. You may need *more* base stations to get coverage.

Also, many products that advertise 5GHz call themselves "dual band" but are really trying to shove a 5GHz signal through a 2.4GHz-tuned antenna and give you a software switch with which to do it. Unsurprisingly, this doesn't work very well. The only way to know you're buying a product that has any hope of speaking proper 5GHz is to buy something labeled "simultaneous dual band" or simply a 5GHz-only product.

My current plan, for what it's worth, is to wait for 802.11ac to stabilize and then look at doing a major home network upgrade once laptops and phones start supporting it.